FlowVision team blog

Today we will talk about minimization of the computational mesh in a two-dimensional calculation. In general, FlowVision is a three-dimensional CFD software. But the 3D calculation becomes 2D if  there is only one calculation cell in one direction. Unfortunately, two-dimensionality disappears when adaptation is enabled. User of FlowVision from JIHT figured out this issue.

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When modeling a physical phenomenon, the most informative way of visualization is video.

In this article, we will describe how to turn a sequence of images into a video clip.

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Sometimes the situations appear, when the co-simulation may be interrupted for a number of reasons:

1. Lack of memory (both operational and physical);
2. Restarting the machine on which the calculation has been carried out.
3. The necessity  to stop the calculation for project modification.

If the simulation is carried out only in FlowVision, the problem is easily solved by continuing the simulation from the last save. In the case of a joint simulation, the procedure is more complicated.

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This article will be useful for the beginners who want to learn more about the turbulent flow and pitfalls encountered during its modeling. We'll go through:

• • • the definition of turbulence
    • basic concepts
    • approaches to turbulent flow modeling
    • recommendations for turbulence modeling in FlowVision

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FlowVision uses floating type of license. It means:

• The license is installed and attached to one computer and can’t be transferred or registered on another computer;

• But users can work with FlowVision on any computer and they can even constantly change their working computer. FlowVision will request a license from the computer on which the license was registered.

• On one computer it’s possible to register many licenses for different users. It allows to avoid blocking license, for example, of the user of neighboring department.
• You can also register one general license, for example, with a large number of cores and allow users to compete for licenses :) This allows you to run the calculation on the maximum number of cores if necessary.

Thus it is convenient for a company to allocate a server for registering and storing a license instead of, for example, a laptop.

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FlowVision 3.11.01 obtained a new connector for linking to Abaqus. The new connector calls Abaqus CSE. This connector expands possibilities of direct coupling connector and has following advantages:

• More flex settings of co-simulation;
• Easier launching at cluster machines;
• Introducing of additional programs into co-simulation;
• Interaction with newest version of SIMULIA Abaqus.

Such advantages are realizing by Abaqus module: Abaqus CSE Director. But such approach has his own disadvantages:

• Abaqus CSE Director requires configuration file for his work;
• Complex launching of Abaqus which is not supporting by MPM-Agent of current FV version.

The problem of file generation was resolved. FlowVision creating file by user request. As input data FlowVision use Abaqus project which needed for connector creating.

Analysis launching by MPM-Agent has problems with commands which are transferring to Abaqus: are separated launching of Abaqus CSE Director and separated launching of project.

Script was created for resolving this problem and making launching of Abaqus more simple. This script taking data from FlowVision project and allows launching both type of connectors: Direct coupling and Co-simulation Engine.

Script as for Windows OS, as for Linux OS is attached to this paper for using.

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